The only thing about this is you HAVE to do exactly 30 minutes 4 times a day, at exactly the same time each nap time for your body to properly adjust. You can't even be 5 minutes late your body will get the necessity for REM all mixed up.
Additional, eat after you wake up, and not for the hour before you go to sleep, you will have less of the hangover feeling when you wake.
Also additionally, drink LOTS of water. Your metabolism will be confused and will try to overcompensate and burn more everything, so you will be eating more than normal and one thing that is overlooked is drinking water.
Also also also moose, stop with the caffeine, any processed foods, so on and so forth. Anything processed and isn't natural will add to the hangover feeling. Consume only organic unprocessed caffeine(organic coffee tastes better too) and tea will be good too, or cut out caffeine at all if you can. The foods, you will boost from X amount of calories a day to 2x out of necessity or your body will over metabolize its self, so you want to eat more, but the more junk the worse you'll feel. Fresh foods make you feel better, and when you're doing this, you tend to be hyper aware of your body.
Those were my experience when I tried this. I was also drinking a bit during this time so that didn't help at all with the regularity of sleep and eventually I crashed, slept for 2 days almost completely straight and decided it was a bad idea.
On the other hand, damn was I productive.